Not everything that you ask OpenGL to render will actually render. OpenGL makes the decision of what to render and not to render depending on what can be seen in a viewing volume. Learn how Clipping occurs in OpenGL.

Do you know how a fragment shader gets its data? Learn how in and out keywords are used to pass data from shader to shader.

Have you ever wondered how does the OpenGL Graphics Pipeline receives data? Learn about the mechanism that OpenGL uses to declare data that will be used as input and what stages are responsible for providing this data to the vertex shader.